SteNicholas opened a new pull request, #3527:
URL: https://github.com/apache/celeborn/pull/3527

   ### What changes were proposed in this pull request?
   
   Change default value of `celeborn.worker.directMemoryRatioForReadBuffer` 
from 0.1 to 0.35.
   
   ### Why are the changes needed?
   
   The default value of `celeborn.worker.directMemoryRatioForReadBuffer` is 
0.1, which is too small to cause a backlog of read buffer requests in 
`ReadBufferDispacther`. Therefore, 
`celeborn.worker.directMemoryRatioForReadBuffer` should be changed from `0.1` 
to `0.35` to raise read buffer threshold of `ReadBufferDispatcher`.
   
   ### Does this PR resolve a correctness bug?
   
   No.
   
   ### Does this PR introduce _any_ user-facing change?
   
   The default value of `celeborn.worker.directMemoryRatioForReadBuffer` is 
changed to 0.35.
   
   ### How was this patch tested?
   
   CI.


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